Osmotic pressure of a solution at a given temperature

• increases with concentration

• decreases with concentration

• remains same

• initially increases and then decreases

The osmotic pressure (At 27° C) of an aqueous solution (200 mL) containing 6 g of a protein is 2 × 10^-3 atm. If R = 0.080 L atm mol^-1 K^-1 , the molecular weight of protein is

• 7.2 × 10⁵

• 3.6 × 10⁵

• 1.8 × 10⁵

• 1.0 × 10⁵

The melting point is highest for

• rock salt

• potassium chloride

• magnesium oxide

• barium oxide

The order of increasing boiling points of-

I. acetyl chloride;

II. acetic anhydride;

III. acetamide;

IV. acetic acid is

• IV > I > II > III

• I > IV > II > III

• II < I < III < IV

• I < IV < II < III

455.

When common salt is dissolved in water

• the melting point of the solution increases

• the boiling point of the solution increases

• the boiling point of the solution decreases

• both the melting and bolling point of the solution decrease

The method which is used to measure the osmotic pressure of a solution quickly and accurately is

• Berkeley-Hartley's method

• de varies method

• Pfeffer's method

• All of the above

Which of the following solvents are aprotic ?

I. NH₃

II. SO₂

III. CH₃CN

IV. CH₃CO₂H

• I, II and III

• I, III and IV

• II and III

• I and III

If 20 g of a solute was dissolve in 500 mL of water and osmotic pressure of the solution was found to be 600 mm of Hg at 15°C, then molecular weight of the solute is

• 1000

• 1200

• 1400

• 1800

Which of the following statement is false?

• Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction

• The osmotic pressure ($\mathrm{\pi }$) of a solution is given by the equation T = MRT, where M is the molarity of the solution

• The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl₂ > KCl > CH₃COOH > sucrose

• Two sucrose solution of same molality prepared in different solvents will have the same freezing point depression

Glucose is added to 1 L water to sch an extent that $∆{\mathrm{T}}_{\mathrm{f}}/ {\mathrm{K}}_{\mathrm{f}}$becomes equal to 10^-3, the weight of glucose (C₆H₁₂O₆ ) added is

• 180 gm

• 18 gm

• 1.8 gm

• 0.18 gm